reactor modifier (Cloth/Soft Body/Rope) > Constraints rollout
As with rigid bodies, you might want to constrain the possible movement of your deformable bodies. For instance, you might want to fix cloth draperies to a position in world space, or attach deformable clothing and hair to a moveable character. However, because deformable bodies can change their shape over the course of the simulation, you can't just specify attachment points in the object's local space as you do with rigid bodies.
Instead, when you work with deformable bodies, you need to specify the vertices to constrain in the deformable mesh. You can then constrain the vertices using one of four deformable constraint types, which you can choose from the deformable body's deformable Constraints rollout.
This section has separate topics for each of the following deformable constraint types:
For information about using the Soft Selection option to smooth the transition between simulated and keyframed vertices for deformable bodies, see Soft Selection.
Note: You can constrain deformable bodies only to points in world space, rigid bodies, or deforming meshes. You can't attach deformable bodies to "live" deformable bodies. You can, however, attach deformable bodies to other deformable bodies once they have been simulated. For example, after simulating a piece of cloth, you can remove it from the Cloth Collection and add it to a Deforming Mesh Collection. You can then attach any deformable body (cloth, soft or rope) to it using the Attach to Deforming Mesh constraint.
Fix Vertices—Creates a Fix Vertices to World constraint that fixes the chosen vertices to their current position in world space.
Keyframe Vertices—Creates a Keyframe constraint that makes the chosen vertices follow their current animation in 3ds Max.
Attach to Rigid Body—Creates an Attach to Rigid Body constraint between the chosen vertices and a rigid body. The vertices follow the animation (changes in position and rotation) of the rigid body.
Attach to DefMesh—Creates an Attach to Deforming Mesh constraint between the chosen vertices and a deforming mesh. The vertices will follow the animation (deformations) of the deforming mesh.
[constraints list]—Displays a list of the deformable constraints for the deformable body. To highlight a constraint for changing its parameters or deleting it, click its name in the list.
Delete Constraint—Deletes the highlighted constraint in the list.